@font-face{font-family:Nunito;src:url(/fonts/nunito-400.woff2)format("woff2");font-weight:400;font-display:swap}@font-face{font-family:Nunito;src:url(/fonts/nunito-700.woff2)format("woff2");font-weight:700;font-display:swap}@font-face{font-family:Nunito;src:url(/fonts/nunito-800.woff2)format("woff2");font-weight:800 900;font-display:swap}@font-face{font-family:Petrona;src:url(/fonts/petrona-400.woff2)format("woff2");font-weight:400;font-display:swap}:root{--ink:#29283e;--muted:#727080;--purple:#7560ad;--purple-deep:#58428c;--lavender:#f0ecf8;--line:#e6e2eb;--paper:#fcfbf8;--white:#fff;--radius:17px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{color:var(--ink);background:var(--paper);margin:0;font:16px/1.6 Nunito,Arial,sans-serif}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline-offset:4px;outline:3px solid #9a79d6}h1,h2,h3,h4,p{margin-top:0}h1,h2{letter-spacing:-1.5px;font-family:Petrona,Georgia,serif;font-weight:400}h2{font-size:36px;line-height:1.2}h3{font-size:21px;font-weight:800;line-height:1.3}p{color:var(--muted)}.sr-only{clip:rect(0, 0, 0, 0);width:1px;height:1px;position:absolute;overflow:hidden}.skip-link{z-index:100;background:#fff;padding:10px;position:fixed;top:-80px;left:20px}.skip-link:focus{top:10px}.site-header{background:var(--paper);border-bottom:1px solid var(--line);height:86px}.header-inner{justify-content:space-between;align-items:center;max-width:1180px;height:100%;margin:auto;padding:0 30px;display:flex}.logo{align-items:center;display:inline-flex}.logo img{width:173px;height:auto}.header-inner nav{align-items:center;gap:34px;font-size:14px;font-weight:800;display:flex}.nav-primary{background:#f1ecf7;border:1px solid #d5cce5;border-radius:10px;align-items:center;gap:8px;padding:10px 16px;display:flex}.hero{text-align:center;background:linear-gradient(118deg,#eee6fa 0%,#e9e4f5 43%,#f8eee6 100%);border-bottom:1px solid #e2d9ec;padding:54px 24px 44px;position:relative;overflow:hidden}.hero-inner{z-index:1;position:relative}.hero-label{letter-spacing:1.7px;color:#625079;background:0 0;border:1px solid #6250792e;border-radius:3px;align-items:center;gap:8px;padding:11px 17px;font-size:11px;font-weight:900;display:inline-flex}.hero h1{margin:21px 0 20px;font-size:65px;line-height:1.07}.hero h1 em{color:#795ca2;font-style:normal}.hero p{color:#70637d;margin-bottom:24px;font-size:17px;line-height:1.6}.button{background:var(--purple);color:#fff;border:1px solid #41364f;border-radius:10px;justify-content:center;align-items:center;gap:16px;padding:12px 21px;font-size:14px;font-weight:800;transition:transform .15s,box-shadow .15s;display:inline-flex;box-shadow:0 3px #41364f}.button:hover{transform:translateY(-1px);box-shadow:0 4px #41364f}.button:active{transform:translateY(2px);box-shadow:0 1px #41364f}.hero-button{color:var(--ink);background:#fff}.hero-note{color:#756783;justify-content:center;align-items:center;gap:6px;margin-top:18px;font-size:11px;display:flex}.hero-orbit{color:#8d76b1;width:145px;position:absolute;transform:rotate(-14deg)}.orbit-one{top:98px;left:10%}.orbit-two{top:179px;right:9%;transform:rotate(16deg)}.biology-art{width:108px;height:103px}.hero-orbit .biology-art{width:100%;height:auto;animation:7s ease-in-out infinite float}.orbit-two .biology-art{animation-delay:-3s}@keyframes float{50%{transform:translateY(-10px)rotate(3deg)}}.learning-strip{border-bottom:1px solid var(--line);color:#716b7c;justify-content:center;gap:70px;max-width:1120px;margin:auto;padding:22px 20px;font-size:12px;font-weight:700;display:flex}.learning-strip span{align-items:center;gap:10px;display:flex}.learning-strip svg{color:#9c8bac}.course-section{max-width:1180px;margin:auto;padding:58px 30px 40px}.eyebrow{letter-spacing:1.7px;color:#8b7c98;margin-bottom:11px;font-size:10px;font-weight:900;display:block}.section-heading{justify-content:space-between;align-items:end;margin-bottom:27px;display:flex}.section-heading h2{margin:0}.section-heading>p{margin-bottom:3px;font-size:13px;line-height:1.5}.explorer-controls{justify-content:space-between;gap:20px;margin-bottom:25px;display:flex}.segmented{border:1px solid var(--line);background:#f5f2f7;border-radius:10px;padding:4px;display:flex}.segmented button{color:var(--muted);background:0 0;border:0;border-radius:7px;padding:6px 18px;font-size:12px;font-weight:800}.segmented button[aria-pressed=true]{color:var(--ink);background:#fff;box-shadow:0 1px 3px #29283e18}.search-box{border:1px solid var(--line);color:#9991a2;background:#fff;border-radius:9px;align-items:center;gap:10px;padding:8px 13px;display:flex}.search-box input{width:225px;color:var(--ink);background:0 0;border:0;outline:none;font-size:12px}.unit-grid{grid-template-columns:repeat(3,1fr);align-items:start;gap:20px;display:grid}.unit-card{--accent:#8b72b0;border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:23px 24px 0;overflow:hidden;box-shadow:0 3px #e7e2e9}.unit-card.mint{--accent:#6c9684}.unit-card.peach{--accent:#bf9475}.unit-card.rose{--accent:#b77d99}.unit-card.blue{--accent:#7294ad}.unit-top{justify-content:space-between;align-items:flex-start;height:85px;display:flex}.unit-label{letter-spacing:1.3px;background:color-mix(in srgb, var(--accent) 12%, white);color:color-mix(in srgb, var(--accent) 80%, #222);border-radius:5px;padding:3px 7px;font-size:10px;font-weight:900}.unit-top .biology-art{color:var(--accent);width:90px;height:86px;margin-top:-12px;transform:rotate(8deg)}.unit-card h3{margin:12px 0 9px;font-size:19px}.unit-card>p{margin-bottom:25px;font-size:12px}.unit-card details{border-top:1px solid var(--line);margin:0 -24px}.unit-card summary{cursor:pointer;justify-content:space-between;align-items:center;padding:13px 24px;font-size:12px;font-weight:800;list-style:none;display:flex}.unit-card summary::-webkit-details-marker{display:none}.unit-card details[open] summary svg{transform:rotate(180deg)}.topic-links{padding:0 16px 10px}.topic-links>a{border-radius:6px;justify-content:space-between;align-items:center;gap:8px;padding:10px 8px;font-size:12px;display:flex}.topic-links>a:hover{background:var(--lavender)}.topic-links small{color:#8d769e;margin-left:7px;font-size:9px;display:inline-block}.topic-state{color:#8a8493;white-space:nowrap;font-size:9px}.course-footnote{color:var(--muted);justify-content:space-between;align-items:center;margin-top:26px;font-size:11px;display:flex}.course-footnote a{color:#7c6994;align-items:center;gap:7px;font-weight:800;display:flex}.gentle-banner{background:#efecf1;border-radius:16px;justify-content:space-between;align-items:center;gap:20px;max-width:1120px;margin:10px auto 70px;padding:35px 40px;display:flex}.gentle-banner h2{margin-bottom:10px;font-size:29px}.gentle-banner p{margin:0;font-size:13px}.secondary{color:var(--ink);background:#fff}.site-footer{border-top:1px solid var(--line);justify-content:space-between;gap:25px;max-width:1180px;margin:auto;padding:35px 30px 50px;display:flex}.site-footer .logo img{width:138px}.site-footer p{margin:12px 0 5px;font-size:13px}.site-footer small{color:var(--muted);font-size:11px}.site-footer>svg{color:#a393b4}.footer-links{color:#776b84;gap:16px;margin-top:16px;font-size:10px;display:flex}.footer-links a{align-items:center;gap:4px;display:flex}.empty-state{text-align:center;padding:55px 20px}.page-intro{max-width:1120px;margin:50px auto 0;padding:0 20px}.page-intro h1{margin-bottom:15px;font-size:46px}.page-intro>p{max-width:650px}.text-page{max-width:740px;min-height:50vh;margin:65px auto;padding:0 24px}.text-page h1{font-size:44px}.text-page a{color:var(--purple-deep);text-decoration:underline}.notice{background:var(--lavender);color:#6d567e;border-radius:9px;padding:13px 17px;font-size:12px}.breadcrumbs{color:#82798c;flex-wrap:wrap;gap:9px;margin-bottom:28px;font-size:12px;display:flex}.breadcrumbs a:hover{text-decoration:underline}@media (min-width:1400px){.hero{padding:60px 24px 50px}.hero h1{font-size:72px}}@media (max-width:900px){.hero h1{font-size:57px}.hero-orbit{width:100px}.orbit-one{top:110px;left:3%}.orbit-two{top:220px;right:3%}.unit-grid{grid-template-columns:repeat(2,1fr)}.header-inner nav{gap:18px}.learning-strip{gap:30px}.gentle-banner{margin:10px 30px 45px}.hero h1{letter-spacing:-2px}}@media (max-width:600px){.site-header{height:auto}.header-inner{flex-wrap:wrap;gap:15px;padding:16px 20px}.logo img{width:150px}.header-inner nav{justify-content:space-between;gap:10px;width:100%;font-size:11px}.nav-primary{padding:7px 9px}.hero{padding:40px 20px 34px}.hero h1{letter-spacing:-1.8px;font-size:43px}.hero p{font-size:15px}.hero-orbit{display:none}.hero-label{font-size:9px}.learning-strip{align-items:center;gap:12px;padding:15px 14px;font-size:9px}.learning-strip span{gap:5px;line-height:1.4}.learning-strip svg{flex-shrink:0;width:15px}.course-section{padding:37px 20px 30px}.section-heading{display:block}.section-heading h2{font-size:31px}.section-heading>p{display:none}.explorer-controls{flex-direction:column;gap:14px}.segmented{width:max-content}.search-box input{width:100%;font-size:13px}.unit-grid{grid-template-columns:1fr;gap:17px}.unit-card{padding:20px 22px 0}.unit-top{height:63px}.unit-card h3{margin-top:6px}.unit-card>p{margin-bottom:20px}.unit-card details{margin:0 -22px}.course-footnote{line-height:1.5;display:block}.course-footnote a{margin-top:12px}.gentle-banner{margin:0 20px 38px;padding:25px;display:block}.gentle-banner .button{margin-top:23px}.site-footer{padding:30px 20px;display:block}.site-footer>div+div{margin-top:27px}.site-footer>svg{display:none}.page-intro h1{font-size:38px}.page-intro{margin-top:35px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}.lesson-layout{max-width:820px;margin:36px auto 80px;padding:0 30px}.topic-toolbar,.topic-course-meta{align-items:center;gap:20px;display:flex}.topic-toolbar{color:var(--muted);justify-content:space-between;margin-bottom:28px;font-size:12px}.topic-back{align-items:center;gap:8px;font-weight:800;display:inline-flex}.topic-course-meta a{text-underline-offset:4px}.topic-course-meta a:hover,.topic-back:hover{color:var(--purple-deep);text-decoration:underline}.note-format-switch{background:#f4f0fa;border:1px solid #e2dcec;border-radius:18px;justify-content:space-between;align-items:center;gap:20px;margin-bottom:34px;padding:20px 24px;display:flex}.note-format-switch strong{font-size:16px}.note-format-switch p{color:var(--muted);margin:5px 0 0;font-size:13px}.note-format-link{color:var(--purple-deep);background:#fffdfa;border:1px solid #cec2df;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;gap:12px;padding:11px 16px;font-size:13px;font-weight:800;display:inline-flex;box-shadow:0 2px #cec2df}.note-format-link:hover{background:#ece5f5}@media (max-width:600px){.topic-toolbar{align-items:flex-start;gap:16px}.topic-course-meta{flex-direction:column;align-items:flex-end;gap:6px}.note-format-switch{flex-direction:column;align-items:flex-start;gap:16px;padding:18px}.note-format-link{width:100%}}.lesson-title h1{margin:13px 0 16px;font-size:57px}.lesson-title>p{font-size:18px}.lesson-meta{color:#928798;border-bottom:1px solid var(--line);flex-wrap:wrap;gap:15px;margin-bottom:35px;padding-bottom:24px;font-size:11px;display:flex}.lesson-blocks h2{letter-spacing:-.5px;margin:35px 0 18px;font-family:Nunito,sans-serif;font-size:25px;font-weight:800}.lesson-blocks p,.lesson-blocks li{color:#645e6d;white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px}.callout{background:0 0;border:1px solid #c9b6dc;border-radius:12px;align-items:start;gap:15px;margin:25px 0;padding:23px;display:flex}.callout>svg{color:#8c70a6;flex-shrink:0;margin-top:3px}.callout strong{font-size:14px}.callout p{margin:6px 0 0;font-size:14px}.callout.misconception{background:0 0;border-color:#dec29f}.callout.misconception>svg{color:#b89468}.table-figure{margin:25px 0}.table-scroll{border:1px solid var(--line);border-radius:12px;overflow:auto}.table-scroll table{border-collapse:collapse;background:#fff;width:100%;min-width:450px;font-size:13px}.table-scroll caption{text-align:left;background:#f7f4fa;padding:15px;font-size:12px;font-weight:800}.table-scroll th,.table-scroll td{text-align:left;border-top:1px solid var(--line);vertical-align:top;padding:14px 17px}.table-scroll thead{background:#f0ecf6}.table-scroll tbody th{width:25%;font-weight:800}.table-scroll td{color:#756b80}.tree-figure{border:1px solid var(--line);background:#fff;border-radius:12px;margin:25px 0;padding:20px 15px 30px}.tree-figure figcaption{color:#83718f;align-items:center;gap:8px;margin-bottom:24px;font-size:12px;display:flex}.diagram-scroll{padding-bottom:8px;overflow:auto}.tree,.tree ul{justify-content:center;gap:14px;margin:0;padding:0;display:flex;list-style:none!important}.tree ul{padding-top:24px;position:relative}.tree li{flex:1;position:relative;text-align:center!important;white-space:normal!important;font-size:11px!important}.tree li>span{z-index:1;background:#f5f0fa;border:1px solid #dcd1e9;border-radius:7px;min-width:85px;max-width:145px;padding:10px;display:inline-block;position:relative}.tree ul:before{content:"";background:#cfc1df;width:1px;height:24px;position:absolute;top:0;left:50%}.tree ul>li:before{content:"";border-top:1px solid #cfc1df;height:12px;position:absolute;top:-12px;left:-8px;right:-8px}.tree ul>li:first-child:before{left:50%}.tree ul>li:last-child:before{right:50%}.tree ul>li:after{content:"";background:#cfc1df;width:1px;height:12px;position:absolute;top:-12px;left:50%}.lesson-figure{margin:25px 0}.lesson-figure img{object-fit:contain;background:#fff;border-radius:10px;max-width:100%;height:auto;max-height:650px}.lesson-figure a>span{color:var(--purple-deep);gap:5px;font-size:11px;display:flex}.lesson-figure figcaption{color:var(--muted);padding-top:8px;font-size:12px}.lesson-practice{border-top:1px solid var(--line);margin-top:50px;padding-top:35px}.lesson-practice>.eyebrow{align-items:center;gap:7px;display:flex}.lesson-practice>h2{margin-bottom:10px;font-size:37px}.lesson-practice>p{font-size:14px}.practice-question{border-bottom:1px solid var(--line);padding:25px 0}.question-number{color:#877198;justify-content:space-between;font-size:16px;font-weight:800;display:flex}.question-number span{font-size:11px;font-weight:400}.practice-question h3{margin-top:12px;font-size:16px}.answer-options{color:#696071;gap:9px;padding-left:30px;font-size:14px;display:grid}.answer-options li{border:1px solid var(--line);background:#fff;border-radius:8px;padding:10px 14px}.mark-scheme{background:#f6f2fa;border:1px solid #d6c9e4;border-radius:11px;margin-top:23px}.mark-scheme>summary{cursor:pointer;justify-content:space-between;padding:17px 20px;font-size:14px;font-weight:800;display:flex}.mark-scheme>div{padding:5px 22px 22px}.mark-scheme article{padding-top:24px}.mark-scheme h3{font-size:17px}.mark-scheme p{font-size:14px}.option-explanation{border-top:1px solid #e4daeb;padding:15px 0 0}.option-explanation strong{color:#8b778f;font-size:12px}.option-explanation.correct strong{color:#46765d}.lesson-sources{color:#8c8193;overflow-wrap:anywhere;margin-top:35px;font-size:11px}.lesson-sources ul{padding-left:15px}.preview-ribbon{color:#fff;text-align:center;background:#41354e;padding:9px 24px;font-size:11px}.preview-ribbon a{margin-left:15px;text-decoration:underline}.written-prompt{font-style:italic;font-size:12px!important}@media (max-width:1000px){.hero-orbit{opacity:.5;width:70px;top:70px}.orbit-two{top:240px}}@media (max-width:800px){.lesson-layout{padding:0 24px;display:block}.lesson-sidebar{display:none}.lesson-title h1{font-size:45px}}@media (max-width:600px){.lesson-layout{margin-top:28px}.lesson-blocks h2{font-size:23px}.callout{padding:18px 16px}.tree{min-width:440px}.lesson-practice>h2{font-size:32px}}.admin-main{max-width:1240px;margin:35px auto 70px;padding:0 30px}.admin-heading{justify-content:space-between;align-items:end;gap:30px;margin:35px 0;display:flex}.admin-heading h1{margin-bottom:15px;font-size:45px;line-height:1.13}.admin-heading p{font-size:13px}.admin-actions{flex-direction:column;align-items:end;gap:18px;padding-bottom:10px;display:flex}.quiet-link{color:#806c95;align-items:center;gap:6px;font-size:12px;display:flex}.tracker-stats{background:#f0ecf5;border:1px solid #e4dbea;border-radius:13px;grid-template-columns:1fr 1fr 1fr 1.5fr;margin-bottom:32px;padding:24px 0;display:grid}.tracker-stats>div{color:#8a7b97;border-right:1px solid #dbd0e6;padding:0 26px;font-size:11px}.tracker-stats>div>span{color:#615073;font-size:29px;font-weight:800;display:block}.tracker-stats>div:last-child{border:0;align-items:center;gap:20px;display:flex}.tracker-stats p{margin:0;font-size:12px}.tracker-filters{gap:15px;margin:25px 0;display:flex}.tracker-filters select,.editor-main select,.login-form input,.campaign-form input,.campaign-form textarea,.campaign-form select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:8px;padding:10px 12px;font-size:12px}.tracker-table{border:1px solid var(--line);background:#fff;border-radius:12px;overflow:auto}.tracker-table table{border-collapse:collapse;text-align:left;width:100%;min-width:700px}.tracker-table th{text-transform:uppercase;letter-spacing:1px;color:#8a7d94;background:#f8f6fa;padding:17px 24px;font-size:10px}.tracker-table td{border-top:1px solid #eee9f1;padding:16px 24px;font-size:12px}.tracker-table td>small{letter-spacing:1px;color:#9b8fa5;margin-bottom:5px;font-size:9px;display:block}.tracker-table td>strong{font-size:13px;font-weight:800}.status-link{color:#9a8ba5;white-space:nowrap;align-items:center;gap:7px;font-size:10px;display:inline-flex}.status-link>span{background:#c6bbcf;border-radius:50%;width:5px;height:5px}.status-link>svg{opacity:0}.status-link:hover>svg{opacity:1}.status-link.draft{color:#b38756}.status-link.draft>span{background:#caa06d}.status-link.published,.status-link.reviewed{color:#5c8c73}.status-link.published>span,.status-link.reviewed>span{background:#77a88c}.batch-cell{color:#a295ad;font-size:10px!important}.workspace-note{padding-top:15px;font-size:11px}.workspace-nav{justify-content:flex-end;gap:20px;font-size:12px;display:flex}.workspace-nav button{color:#83708f;background:0 0;border:0;font-size:12px}.editor-main{max-width:1280px;margin:0 auto 70px;padding:0 30px}.editor-topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:15px;padding:18px 0;display:flex}.editor-topbar>a{color:#85768f;align-items:center;gap:8px;font-size:12px;display:flex}.editor-topbar>div:last-child{gap:8px;display:flex}.save-state{color:#8f8299;align-items:center;gap:6px;font-size:10px;display:flex}.save-state>span{background:#86a78c;border-radius:50%;width:5px;height:5px}.save-state>span.unsaved{background:#cfac71}.small-button{color:#766184;background:#fff;border:1px solid #dcd2e6;border-radius:7px;align-items:center;gap:7px;padding:8px 12px;font-size:11px;font-weight:800;display:inline-flex}.small-button.primary{color:#fff;background:#7f649f;border-color:#7f649f}.editor-heading{justify-content:space-between;align-items:center;margin:32px 0 24px;display:flex}.editor-heading h1{margin:0;font-size:39px}.editor-heading .segmented button{align-items:center;gap:7px;display:flex}.editor-grid{grid-template-columns:minmax(0,1fr) 250px;align-items:start;gap:28px;display:grid}.document-canvas{border:1px solid var(--line);background:#fff;border-radius:13px;padding:30px}.editor-main label,.media-dialog label,.login-form label,.campaign-form label{color:#8a7695;flex-direction:column;gap:7px;margin-bottom:18px;font-size:11px;font-weight:800;display:flex}.editor-main input,.editor-main textarea,.media-dialog input,.media-dialog select{color:#514559;background:#fff;border:1px solid #e6dfea;border-radius:7px;width:100%;padding:10px 12px;font-size:13px}.editor-main textarea{resize:vertical;min-height:45px;line-height:1.6}.editor-fields{padding-bottom:8px}.editor-fields>label:first-child input{font-size:22px;font-weight:800}.edit-block{border:1px solid #e8e1ed;border-radius:9px;margin:20px 0;padding:17px}.block-toolbar{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.block-toolbar>span{letter-spacing:1px;color:#a08daa;text-transform:uppercase;font-size:9px}.block-toolbar>div{gap:4px;display:flex}.icon-button{color:#ad9db7;background:0 0;border:0;justify-content:center;align-items:center;padding:4px;display:inline-flex}.icon-button:hover{color:#67506f;background:#f3edf7;border-radius:4px}.edit-block label:last-child{margin-bottom:0}.heading-input{font-weight:800;font-size:20px!important}.field-hint{color:#a393ae;font-size:10px;line-height:1.5}.add-block-bar{border-top:1px dashed #dfd5e8;flex-wrap:wrap;gap:8px;margin-top:24px;padding:20px 0;display:flex}.add-block-bar>span{color:#ad9bb9;width:100%;margin-bottom:4px;font-size:10px}.add-block-bar button{color:#92759f;background:#faf7fc;border:1px solid #e5dbea;border-radius:6px;align-items:center;gap:6px;padding:7px 9px;font-size:10px;display:flex}.editor-settings>div{background:#f4f0f7;border:1px solid #e7deec;border-radius:10px;margin-bottom:17px;padding:20px}.editor-settings textarea,.editor-settings input{font-size:11px}.editor-file-tools{flex-direction:column;gap:14px;display:flex}.editor-file-tools>button{text-align:left;color:#9277a0;background:0 0;border:0;align-items:center;gap:8px;font-size:11px;display:flex}.editor-preview{border:1px solid var(--line);background:#fff;border-radius:14px;max-width:730px;margin:35px auto;padding:35px}.question-editor{border-top:1px solid var(--line);margin-top:35px;padding-top:30px}.question-editor>h2{margin-bottom:10px;font-size:30px}.question-editor>p{font-size:12px}.question-options-settings{grid-template-columns:1fr 80px;gap:15px;display:grid}.option-editor{background:#faf7fc;border:1px solid #e9e0ef;border-radius:7px;margin:15px 0;padding:15px}.correct-choice{align-items:center;flex-direction:row!important;font-size:10px!important;display:flex!important}.correct-choice>input{width:auto}.text-button{color:#9873a5;background:0 0;border:0;padding:8px 0;font-size:11px}.editable-table{overflow:auto}.editable-table table{border-collapse:collapse;width:100%;min-width:350px}.editable-table th,.editable-table td{padding:3px}.editable-table textarea{min-width:100px;font-size:11px}.editable-table th input{background:#f5f0f8;font-size:11px}.inline-tools{flex-wrap:wrap;gap:12px;margin-top:10px;display:flex}.inline-tools button{color:#987aa5;background:0 0;border:0;font-size:10px}.tree-editor>div{grid-template-columns:1fr 1fr 20px;align-items:center;gap:8px;margin-bottom:8px;display:grid}.tree-editor input,.tree-editor select{font-size:11px}.image-block-preview{align-items:center;gap:20px;margin-bottom:20px;display:flex}.image-block-preview img{object-fit:contain;max-width:200px;max-height:150px}.form-error{color:#a04f51;white-space:pre-wrap;overflow-wrap:anywhere;background:#fff0ee;border:1px solid #ebcccc;border-radius:8px;margin:16px 0;padding:15px 18px;font-size:12px}.review-panel{z-index:20;background:#fff;border:1px solid #e3d6eb;border-radius:14px;width:420px;max-width:calc(100vw - 40px);max-height:75vh;padding:28px;position:fixed;top:110px;right:20px;overflow:auto;box-shadow:0 8px 45px #36284230}.review-panel h2{font-size:29px}.review-panel p,.review-panel li{font-size:13px}.history-row{border:0;border-bottom:1px solid var(--line);text-align:left;background:0 0;justify-content:space-between;gap:20px;width:100%;padding:15px 0;font-size:12px;display:flex}.history-row>span{color:#9b88a6;font-size:10px}.login-form{max-width:420px}.campaign-form{margin-top:30px}.media-dialog{width:750px;max-width:95vw;max-height:90vh;color:var(--ink);background:var(--paper);border:1px solid #e5d9ed;border-radius:16px;padding:30px}.media-dialog::backdrop{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#30243f70}.dialog-heading{justify-content:space-between;align-items:start;gap:20px;display:flex}.dialog-heading h2{margin-bottom:13px;font-size:30px}.media-dialog>p{font-size:12px}.media-rights{grid-template-columns:1fr 1fr;gap:20px;display:grid}.upload-zone{color:#91749f;cursor:pointer;background:#f4eff8;border:1px dashed #bea6d1;border-radius:12px;flex-direction:column;align-items:center;gap:10px;padding:30px;display:flex}.upload-zone strong{font-size:13px}.upload-zone span{font-size:11px}.media-grid{grid-template-columns:repeat(3,1fr);gap:15px;margin-top:22px;display:grid}.media-thumb{border:1px solid var(--line);text-align:left;background:#fff;border-radius:9px;flex-direction:column;gap:5px;padding:10px;display:flex;overflow:hidden}.media-thumb img{object-fit:contain;width:100%;height:95px}.media-thumb strong{overflow-wrap:anywhere;font-size:11px}.media-thumb small{color:var(--muted);font-size:9px}.muted-note{color:#ac98b9;justify-content:center;align-items:center;gap:10px;padding:15px;font-size:12px;display:flex}@media (max-width:950px){.editor-grid{grid-template-columns:minmax(0,1fr) 210px;gap:16px}.document-canvas{padding:20px}.editor-settings>div{padding:15px}.admin-heading h1{font-size:38px}.tracker-stats>div{padding:0 18px}.tracker-stats>div:last-child{gap:10px}.editor-topbar{flex-wrap:wrap}.editor-topbar .save-state{order:3;width:100%}}@media (max-width:700px){.editor-grid{display:block}.editor-settings{margin-top:20px}.editor-main{padding:0 15px}.editor-heading{flex-wrap:wrap;gap:15px}.document-canvas{padding:17px}.editor-settings{grid-template-columns:1fr 1fr;gap:14px;display:grid}.admin-main{padding:0 20px}.admin-heading{display:block}.admin-actions{align-items:start;margin-top:20px}.tracker-stats{grid-template-columns:repeat(3,1fr)}.tracker-stats>div:last-child{display:none}.tracker-stats>div:nth-child(3){border:0}.tracker-filters{flex-wrap:wrap}.tracker-stats>div{padding:0 14px;font-size:10px}.editor-preview{padding:22px}.media-rights{display:block}.media-grid{grid-template-columns:repeat(2,1fr)}}.spec-reference{color:var(--muted);text-underline-offset:3px;margin:0 0 20px;font-size:12px;display:inline-block}.spec-reference:hover{color:var(--purple);text-decoration:underline}.spec-units{border-top:1px solid var(--line);margin:28px 0 20px}.spec-unit{border-bottom:1px solid var(--line)}.spec-unit summary{cursor:pointer;align-items:center;gap:18px;padding:19px 0;list-style:none;display:flex}.spec-unit summary:after{content:"+";color:var(--muted);margin-left:2px;font-size:22px}.spec-unit[open] summary:after{content:"−"}.spec-unit summary>span:first-child{min-width:83px;color:var(--muted);font-size:12px}.spec-unit summary strong{font-size:16px}.spec-count{white-space:nowrap;color:var(--muted);margin-left:auto;font-size:12px}.spec-unit ul{margin:0 0 18px 101px;padding:0;list-style:none}.spec-unit li{align-items:center;gap:12px;padding:7px 0;font-size:14px;display:flex}.spec-unit li small{color:var(--muted)}.spec-note{color:var(--muted);font-size:12px;line-height:1.65}@media (max-width:600px){.spec-unit summary{gap:10px}.spec-count{display:none}.spec-unit summary:after{margin-left:auto}.spec-unit ul{margin-left:0}.spec-unit summary strong{font-size:14px}}.hero h1{font-size:clamp(36px,4.7vw,64px)}.orbit-one{width:125px;top:118px;left:4%}.orbit-two{width:110px;top:213px;right:3%}@media (max-width:1000px){.hero-orbit{display:none}}.lesson-contents{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:0 0 30px;padding:13px 0;font-size:13px}.lesson-contents summary{cursor:pointer;font-weight:800}.lesson-contents nav{gap:9px;padding:15px 0 3px;display:grid}.lesson-contents a{color:var(--purple-deep);text-underline-offset:3px;text-decoration:underline}.lesson-blocks h2,#practice{scroll-margin-top:105px}.mobile-lesson-modes,.table-scroll-hint{display:none}@media (max-width:600px){.lesson-blocks .table-scroll-hint{color:var(--muted);margin:0;padding:10px 16px;font-size:12px;display:block}}@media (max-width:800px){.mobile-lesson-modes{border-bottom:1px solid var(--line);gap:20px;margin-bottom:18px;padding:18px 0;font-size:12px;display:flex}.mobile-lesson-modes [aria-current=page]{color:var(--purple-deep);text-underline-offset:7px;font-weight:900;text-decoration:underline}}.art-figure{object-fit:contain;max-width:100%;display:block}.art-floating{animation:7s ease-in-out infinite float}.hero-orbit .biology-art{object-fit:contain;height:140px}.art-controls{flex-wrap:wrap;align-items:end;gap:24px;margin:30px 0 18px;display:flex}.art-controls label{gap:8px;font-size:13px;font-weight:800;display:grid}.art-controls input:not([type=checkbox]),.art-controls select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:10px;padding:12px 14px}.art-controls .art-motion{align-items:center;padding-bottom:12px;display:flex}.art-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;display:grid}.art-card{border:1px solid var(--line);background:#fff;border-radius:18px;padding:22px}.art-stage{place-items:center;height:180px;margin-bottom:22px;display:grid}.art-stage img{width:100%;height:160px}.art-card h2{margin:9px 0;font:800 17px Nunito,Arial,sans-serif}.art-card p{color:var(--muted);font-size:12px;line-height:1.65}.art-card code{color:var(--muted);margin-top:15px;font-size:11px;display:block}.art-downloads{gap:20px;font-size:13px;font-weight:800;display:flex}@media (prefers-reduced-motion:reduce){.art-floating,.hero-orbit .biology-art{animation:none}}.newsletter-panel{border:1px solid var(--line);background:#f0eaf8;border-radius:22px;grid-template-columns:1fr 1fr;gap:50px;max-width:1080px;margin:70px auto;padding:38px;display:grid}.newsletter-panel h2{margin:12px 0;font-size:35px}.newsletter-panel p{font-size:14px;line-height:1.7}.newsletter-panel form{gap:16px;display:grid}.newsletter-panel label{gap:7px;font-size:13px;font-weight:800;display:grid}.newsletter-panel input:not([type=checkbox]),.newsletter-panel select{border:1px solid var(--line);width:100%;color:var(--ink);background:#fff;border-radius:9px;padding:12px}.newsletter-panel .consent{align-items:flex-start;gap:10px;font-size:12px;font-weight:400;line-height:1.6;display:flex}.consent input{flex:none;margin-top:4px}.newsletter-small{margin:0;font-size:11px!important}.newsletter-honeypot{position:absolute;left:-10000px}@media (max-width:750px){.newsletter-panel{grid-template-columns:1fr;gap:20px;margin:35px 18px;padding:24px}.newsletter-panel h2{font-size:29px}}.library-picker{border:1px solid var(--line);border-radius:12px;margin:18px 0;padding:16px}.library-picker summary{cursor:pointer;font-size:14px;font-weight:800}.library-picker label{gap:8px;margin-top:14px;font-size:13px;display:grid}.library-picker select{border:1px solid var(--line);background:#fff;border-radius:8px;width:100%;padding:10px}.library-picker img{width:150px;height:150px;margin:20px auto}.library-picker p{color:var(--muted);font-size:12px}.question-reading-link{color:var(--purple-deep);text-underline-offset:4px;margin:0 0 18px;font-size:13px;text-decoration:underline;display:inline-block}.specified-practical{background:0 0;border:0;border-top:1px solid #e6dcf1;border-radius:0;margin:32px 0;padding:30px 0;scroll-margin-top:105px}.practical-label{color:#715491;align-items:center;gap:9px;font-size:12px;font-weight:800;display:flex}.lesson-blocks .specified-practical h2{margin:14px 0 8px;font-size:clamp(28px,3vw,36px)}.specified-practical h3{margin:24px 0 8px;font-size:16px}.practical-source{color:#715491;text-underline-offset:4px;font-size:12px;text-decoration:underline}.specified-practical li{margin-bottom:8px}.specified-practical>p:last-child{margin-bottom:0}@media (max-width:600px){.specified-practical{padding:24px 0}.lesson-blocks .specified-practical h2{font-size:24px}}.keyword-page{max-width:920px}.keyword-notice{background:#f5f0fb;border:1px solid #e6dcf1;border-radius:14px;margin:25px 0;padding:17px 20px;font-size:14px}.keyword-search{font-weight:800;display:block}.keyword-search input{width:100%;margin-top:9px;display:block}.keyword-alphabet{flex-wrap:wrap;gap:7px;margin:24px 0;display:flex}.keyword-alphabet a,.keyword-alphabet span{border-radius:9px;place-items:center;width:34px;height:38px;font-size:13px;font-weight:800;display:grid}.keyword-alphabet a{color:#654782;background:#f0e9f8}.keyword-alphabet a:hover{background:#dfd1ef}.keyword-alphabet span{color:#b8afc2}.keyword-letter{grid-template-columns:45px 1fr;gap:18px;margin-top:30px;scroll-margin-top:110px;display:grid}.keyword-letter h2{color:#8b70a6;margin:20px 0;font-size:34px}.keyword-letter dl{margin:0}.keyword-entry{border-bottom:1px solid var(--line);padding:22px 0;scroll-margin-top:110px}.keyword-entry:target{background:#f5f0fb;border-radius:8px;outline:12px solid #f5f0fb}.keyword-entry dt{font-size:21px;font-weight:900}.keyword-entry dd{margin:0}.keyword-entry dd p{margin:8px 0;font-size:16px}.keyword-entry dd .keyword-exam-note{color:var(--muted);font-size:14px}.keyword-source{color:#715491;font-size:12px;text-decoration:underline}.keyword-trigger{appearance:none;color:inherit;font:inherit;cursor:help;background:0 0;border:0;border-bottom:1px dotted #987ab5;margin:0;padding:0;display:inline}.keyword-trigger:hover,.keyword-trigger[aria-expanded=true]{color:#654782;background:#eee4f8}.keyword-popup{z-index:100;color:#40334d;background:#fffcff;border:1px solid #d9cbe9;border-radius:15px;flex-direction:column;gap:10px;width:min(320px,100vw - 24px);padding:22px;font:14px/1.55 Nunito,Arial,sans-serif;display:flex;position:fixed;overflow:auto;box-shadow:0 8px 30px #37274225}.keyword-popup strong{padding-right:20px;font-size:18px}.keyword-popup small{color:#71657b;font-size:12px}.keyword-popup a{color:#715491;font-weight:800;text-decoration:underline}.keyword-popup>button{background:0 0;border:0;width:32px;height:32px;font-size:24px;position:absolute;top:9px;right:9px}.quiz-progress{color:var(--muted);justify-content:space-between;align-items:center;gap:20px;font-size:13px;display:flex}.quiz-progress progress{accent-color:#9b80b8;width:110px;height:7px}.quiz-marks,.quiz-session-note{color:var(--muted);font-size:12px}.quiz-options{border:0;gap:10px;margin:20px 0;padding:0;display:grid}.quiz-options label{text-align:left;color:var(--ink);cursor:pointer;border:1px solid #ded5e6;border-radius:13px;grid-template-columns:18px 18px minmax(0,1fr);align-items:start;gap:12px;margin:0;padding:16px;font-size:15px;font-weight:400;line-height:1.6;display:grid}.quiz-options label:hover{background:#f5f0fb}.quiz-options input[type=radio]{accent-color:#8767a8;flex-shrink:0;width:16px;height:16px;margin:4px 0 0;padding:0}.quiz-options .option-letter{color:var(--muted);font-size:12px;font-weight:900}.quiz-options .quiz-selected{background:#f1e9fa;border-color:#a68abc}.quiz-options .quiz-correct{background:#eff7f1;border-color:#93b39e}.quiz-options .quiz-incorrect{background:#fcf0ed;border-color:#d0a59b}.quiz-options .option-text{overflow-wrap:anywhere;min-width:0}.quiz-options strong{grid-column:3;margin:0;font-size:12px}.teaching-list .explicit-list-number{list-style:none}.teaching-list-caption{margin-bottom:8px;font-weight:700}.teaching-list li{margin-bottom:8px}.practice-question h3{overflow-wrap:anywhere;line-height:1.6}.quiz-options:disabled label{cursor:default}.quiz-feedback{background:#f5f0fb;border-radius:15px;margin:20px 0;padding:22px}.quiz-option-explanation{border-top:1px solid #e2d8ed;margin-top:14px;padding-top:14px}.quiz-option-explanation p{margin-bottom:0}.quiz-navigation{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;margin-top:20px;padding-top:20px;display:flex}.quiz-navigation>button:first-child,.quiz-finish>button:last-child{color:#715491;background:0 0;border:0;font-weight:800}.topic-quiz button:disabled{opacity:.45;cursor:not-allowed}.topic-quiz textarea{width:100%;margin:10px 0 20px;display:block}.quiz-finish{background:#f1edf8;border-radius:18px;padding:25px}.quiz-finish>button{margin:10px 14px 0 0}.keyword-edit{border:1px solid var(--line);border-radius:14px;margin:18px 0;padding:18px}@media (max-width:600px){.keyword-letter{grid-template-columns:26px 1fr;gap:12px}.quiz-options label{flex-wrap:wrap;gap:8px;padding:13px}.quiz-options strong{margin-left:0}}.keyword-search input{appearance:none;font:inherit;color:var(--ink);background:#fffdfa;border:1px solid #d8cde4;border-radius:12px;padding:14px 16px;font-weight:400}.keyword-entry dt a{text-decoration:none}.keyword-entry dt a:hover{text-decoration:underline}@media (max-width:600px){.header-inner nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px;font-size:12px;display:grid}.header-inner nav>a{justify-content:center;align-items:center;min-height:35px;display:flex}}.specified-practical p,.callout p,.quiz-feedback p{white-space:pre-line}.specified-practical details{margin-top:.8rem}.specified-practical summary{cursor:pointer;font-weight:600}.practical-model-answer{background:#f5f0fb;border:1px solid #e6dcf1;border-radius:16px;margin:24px 0;padding:22px}.specified-practical .practical-model-answer h3{margin-top:0;font-size:20px}body{padding-bottom:calc(76px + env(safe-area-inset-bottom,0px))}.keyword-help-switch{right:max(18px, env(safe-area-inset-right,0px));bottom:calc(18px + env(safe-area-inset-bottom,0px));z-index:40;min-height:48px;color:var(--ink);cursor:pointer;background:#fcfaff;border:1px solid #d9cde5;border-radius:16px;align-items:center;gap:10px;padding:10px 14px;font:700 14px Nunito,sans-serif;display:flex;position:fixed;box-shadow:0 4px 18px #45325714}.keyword-help-switch:focus-visible{outline-offset:3px;outline:3px solid #9475b5}.keyword-help-state{color:var(--muted);min-width:20px;font-size:12px}.keyword-help-track{background:#c8c2cf;border-radius:20px;width:38px;height:22px;padding:3px}.keyword-help-track>span{background:#fff;border-radius:50%;width:16px;height:16px;transition:transform .16s;display:block}.keyword-help-switch[aria-checked=true] .keyword-help-track{background:#9070b0}.keyword-help-switch[aria-checked=true] .keyword-help-track>span{transform:translate(16px)}@media (prefers-reduced-motion:reduce){.keyword-help-track>span{transition:none}}